Gear-tooth-finishing machine



Jan. 27,- 1931. H. D. TANNER ET AL GEAR TOOTH FINISHING MACHINE FiledNov. 26. 1927 7 Sheets-Sheet 1 HlQ/g/VVENTOH Q/YWP/l Br y w Jan. 27,1931. H. D.-TANNER ET AL 5 0 .GEAii TOOTH FINISHING MACHINE Filed Nov.26. 1927 7 Sheets-Sheet 2 INVENTUR Jan. 27, 1931. H. D. TANNER ET AL1,790,560

GEAR TOOTH FINISHING MACHIIIIE Filed Nov. 26. 1927 7 Sheets-Sheet s 4 vg Haw/511E170 B, as. M

Jan. 27, 1931. NE ET AL 7 1,790,560

GEAR TOOTH FINISHING MACHINE.

Filed Nov. 26. 1927 .7 she ts-s eet 4 C9 gum/2 n. 119% M Anni/ r Jan.27, 1931.-

H. D. TANNER ET AL GEAR TOOTH FINISHING MACHINE Filed Nov. 26. 1927 7Sheets-Sheet 5 INVENTOH Jan. 27, 1931. H. D. TANNER ET AL 1,790,560

GEAR TOOTH FINISHING MACHINE I Filed Nov. 26. 1927 7 Sheets-Sheet 6 Jan.2 7, 1931. H. D. TANNER ET AL 1,790,550

GEAR TOOTH FINISHI NG MACHINE Filed Nov. 26. 1927 7 Sheets-Sheet 7 f 1 Ilmwron L Y H195 Patented Jan. 27, 1931 UNITED STAT S PATENT OFFICEKUBERT D. TANNER AN D ROBERT R. RABER, OF WEST HARTFORD, CONNECTICUT,AS-

SIGNORS TO PRATT & WHITNEY COMPANY, OF NEW YORK, N. Y., A. CORPORATIONOF NEW JERSEY em-roorn-rmrsnme macnr'ms' Application filed November as,1927. Serial No. 235,866;

This invention relates to a gear tooth finishing machine and inparticular to a machine 'for shaving or taking a finishing cut over thetooth curves ofa gear by a tool moving in the direction ofthe rollingmotion of the gears More particularly the invention relates toimprovements in a machine of the type shown and described in the patentgranted to Barnes No. 1,608,052, dated November-23, 1926.

An object of the present invention is to'provide a machine in which thegear being finished is mounted on a spindle oscillating about a fixedaxis and in which the tool or tools are moved back and forth in astraight line in timed relation to the oscillatory movements of thespindle. v

Another-object of the invention is to provide a-cam locked to thespindle carrying the gear during the cutting portions of its oscillatorymovements for efiecting the reciprocating movements of the tools, thecambeingformed so that the tools will pass over the profiles of the gearteeth to properly generate the curved tooth form.

Another object of the invention is to -provide means for effectingfeeding movement of the tools during operation and indexing movements ofthe spindle when the tools are out of contact with the gear blank to pro80 gressively cut the teeth during successive rotations of the blank.

Another object of the invention is to index the gear during thecontinued oscillatory movements of the spindle and reciprocatorymovements of the tools, this indexing taking place while the spindle isrotating in one di-.

rection so that each of the gear teethmay be engaged successively by thetools during a revolution of the spindle without loss of time.

Another object oft-the invention is to provide vmeans associated withthe indexing mechanism to move the gear a slight distance away from atool when the tool has reached the end'of its cuttin stroke over thetooth profile so that when t e direction of rotation of the spindle andthe movementof the tool is reversed the tool will not drag over'thefinished surfaces of the gear teeth.

Another object is to effect the feeding movementsof the tools at thecompletion of .vention can each rotation of thespindle and ear and aftera plurality of completerevo utions of the spindle, to discontinueoperation of the machine. v

Another object-of the invention is to provide blank positioningmeans toproperly locate the blank on the'spindle so that opposite sides ofdifferent teeth ma be finished simultaneously by opposed too s. Alsoassociated with this blank positioning means is an interlock mechanismpreventing starting of the I machine when the positioning means is inengaged pos1t1on, and prevent ng movement of the positioning means toits engaged position during normal operation of the machine.

Vith these and other objects ,in'view, our invention consists in thefeatures of construction and operation set forth in the followingspecification and illustrated in the accompanying drawings.

In the accompanying drawings annexed hereto and forming a part of thisspecification, we have shown our invention embodied 1n an automatlc gearshaving machlne adapta ed for rapid production of duplicate spur gears,but it will be understood that the inbe otherwise embodied and that the'drawings are not to be construed as defining or limiting the scope ofthe invention,

the claims appended to this specification being relied upon for thatpurpose.

n the drawings;

Figure 1 is a front elevation of the coinplete machine made according tothe present invention, parts'being broken away to more clearly show theconstruction.

Fig. 2 is aside elevation in section taken from the right hand side ofthe machine as seen in Fig.1.

Fig. 3 is a side elevation in section of the complete machine taken fromthe opposite side from that shown in Fig. 2

Fig. 4 is a front elevation of the tools and Fig. 6 is a partialrearelevationin secsleeve showing the locking bolt actuatingmechanism.

Fig. 10 is a longitudinal section through the spindle and showing theseparating, indexing and locking mechanisms thereon.

Fig. 11 is a fragmentary front elevation in section taken on-line 1111of Fig.2 showing the stop mechanism for the machine.

Fig. 12 is an elevation in section taken on line 12-12 of Fig. 2 showingthe means for effecting feeding movements of the tools.

' Fi 13 is a plan view of the actuating member or the tool feedingmeans.

Fig. 14; is a side elevation in section of thei actuating means forfeeding the tools, an

Fig. 15 is a plan view of the stopping mechanism taken on line 15-15 ofFig. 2.

In the above mentioned drawings, we have shown but one embodiment of theinvention which is now deemed preferable, but itis to be understood thatchanges and modifica tions may be made within the scope of the appendedclaims without departing from the spirit of the invention.

Briefly, and in its broadest aspect, our ino vention comprises thefollowing principal parts: First, a base; second, a sleeve rotatablymounted infixed bearings provided in the base; third, means to oscillatesaid sleeve through a predetermined adjustable angle; fourth, a worksupporting-spindle rotatably mounted within said sleeve; fifth, means toindex said .work supporting spindle relative .to the sleeve while thesleeve is oscillating and lock the spindle in indexed position; sixth, acam fixed to and oscillating with said sleeve; seventh,-a slide mountedon the base reciprocated by oscillatory movementof said sleeve and cam;eighth, oppositelydisposed tool heads mounted on said slide and movablethereon toward and from each other; ninth, cam means to effect movementsof said tool heads to effect feeding movements thereof relative to agear on said work supporting spindle; tenth, means to actuate thetoolfeed- 7 ing means after each complete rotation of the spindle and'blank; eleventh, means to stop operation of the machine after apredetermined cycle of operations; twelfth, means to separate the toolsfrom the blank when they have completed their cutting movement;thirteenth, positioning means for the blank gear 16.

for correctly disposing the blank angularly relative to the spindle; andfourteenth, in-

terlocking mechanism between the positioning means and the operatingmeans for the machine.

Referring more in detail to the figures of 1 v the drawings, we providea base 10 having two fixed bearingsll therein. Adapted to freelyoscillate within these bearings 11 is a hollow spindle or sleeve 12. Tooscillate the sleeve an arm 13 is suitably secured thereto, its outerend being attached to a connecting rod .14. The opposite or lower end ofthe connecting rod 14 engages a crank pin 15 adjustably secured upon oneface of a gear 16. Rotation of the gear 16 which is keyed directly to ahorizontal driv ing shaft 17 will therefore oscillate the sleeve 12, theangular 'or oscillatory'movement of the sleeve 12 depending upontheradial position of the crank pin '15 in the To rotate the gear 16 andits shaft 17, which preferably are disposed within the lower partof thebase 10, a motor 18 is provided. This motor 18, through suitablereducing gears 19 and an intermediate shaft 20, drives a pinion 21 onsleeve 22 engaging teeth formed on the periphery of the gear 16 carryingthe crank pin 15; On the inter-.

mediate shaft 20 for driving the pinion 21 Y is a friction clutch 23,one member of which is on shaft 20 constantly rotated by the motor 18and the other member is keyed to the sleeve 22. The pinion 21 is keyedor otherwise secured directly to the sleeve 22. A

.second clutch of the friction type 24 has one member rotating with thesleeve 22 .and

its companion member is maintained against rotation preferably by beingfixed' rigidly to a part of the base 10. This clutch 24 when its membersare in engaged position acts as a brake to stop rotation of the sleeve22 and gear 16.

The friction clutches-23 and 24- are operated by a central member 25movable on the sleeve 22 by a yoke member 26 keyed to a shaft 27 mountedwithin the base 10. The outer end of this shaft 27 is provided with anupwardly extending lever 28.' This lever 28 by means of asuitable-connecting rod is attached to a hand lever 29 plvotally mountedon the outside of thebase 10. From the above description it will ;beseenthat movement of the hand lever 29 to one operative position willengage friction clutch 23 to rotate the pinion 21 and thus 05011- latethe sleeve 12. Movement of the lever 29 to its opposite operativepositionwill engage friction clutch or brake 24-and thus quickly bringthe machine to rest.

Within the hollow spindle'or sleeve is:

a work supporting spindle 30 to -which a gear W to be finished isadapted to beattached in any preferred manner as by means of the colletchuck 31 shown in Fig. 3. Ad jacent the work" securing. means andsurrounding the forward end of this spindle is mounted a large cam 32.-This cam 32 isattached rigidly to thesleeve 12 but in that there are twooppositely disposed cam' portions. The particular contour of these camportions will vary with the characteristics of the gear W being finishedbut in each instance the cam is so designed that the distance betweenpoints on these cam portions simultaneously engaged by rollers on thetool slide will be equal.

Means to index'the work supporting spindle 30 within and relative to thesleeve 12 areprovided adapted to angularly advance or rotate the. workspindle 32 and gear W relative to the sleeve 12 to permit operationsuccessively upon each of the gear teeth being finished. This indexingmeans operates during the oscillating movements of the spindle 30 andsleeve 12 and will presently be described.

.Mounted in suitable horizontal ways 33 30 extending transversely on amember 34 secured to the upper surface of the base 10 adjacenttheforward end of the work spindle 30 is a slide 35. This slide 35 ismovable within the ways 33 which are disposed below and at right anglesto the axis of the sleeve 12 and work spindle 30. Near the opposite endsof the slide are provided opposed heads 36 which are adjustable withinslight limits along the slide 35 and adapted to be rigidly securedthereto in any adjusted position. On the heads-36 are mounted rollers 37oppositely disposed and adapted to contact with the periphery of the cam32 on the sleeve 12. Each cam' 32 for the sleeve 12 is so designed thatduring oscillation of the sleeve 12 and the work supporting spindle 30it is simultaneously engaged by the rollers 37in all of its oscillatedpositions. Oscillatory movement of the. sleeve 12 and spindle 30 andengagement of the cam 32 with the rollers 37 on the slide 35 producesreciprocatorymovement of the slide 35 in timed relation\to oscillationsof the sleeve 12 and gear W being finished.

Also mounted on the slide 35 are oppositely disposed tool holding heads38 mounted for slidable movement toward and from eachother. For thatpurpose the tool holding heads 38 are mounted in ways 39 provided 38have tool supporting devices adapted to hold straight edged upwardly andobliquely extending tools 40 respectively at their inner ends. The tools40, as shown in Fig. 4, are

oppositely disposed so that they are adapted to engage and cut op ositesides ofgear teeth. on the blank s the gear W, and its spindle 30 areindexed between each complete oscillatory movement of the sleeve 12 thegear teeth will all be in contact with and will be cut by'the tools 40during a complete revolution of the work spindle 30. The tools 40 engagethe gear teeth near the extreme oscillated positions of the cam 32 andspindle 30. At the extreme oscillated points of oscillation of thespindle 30 and sleeve 12 the tools 40 have completed their cuttingmovement 7 and upon reversal of the spindle and sleeve move away fromthe'gear teeth. During the mid portions of the oscillatory movements ofthe sleeve 12 and spindle 30 both of the tools 40 are free from the gearW being finished. At this mid portion of the oscillatory movement of thespindle 30 and sleeve 12 while these parts aremoving in one directionthe indexing mechanism operates .to'

index the spindle 30 relative 'to the sleeve 12 to present successive oradjacent teeth to the tools upon the following oscillation.

As it is desirable to takesuccessive cuts upon each of the gear teeth,means are provided to advance the tools 40 a very slight distance at theend of complete revolutions of the spindle 30 and gear W being finished.In the present embodiment of the invention the gear W being finished isadapted'to be indexed through four complete revolutions and its toothcurves are engaged by and cut by the tools 40 upon each revolution ofthe gear.

On the slide 35 at its opposite ends are mounted forwardly andhorizontally extendingshafts 41. On these shafts 41 are mountedperipheral cams 42, their cam contours being in contact with the outerends of screws 43 threaded into the tool holding heads 38. Rotation ofthe cams 42 will therefore advance the tool holding heads 38 towardseach other against the pressure of springs 44 normally holding the toolheads 38 as far apart as possible. The shafts 41 carrying the feed cams42 are adapted to be rotated simultaneously and are for that purposeprovided at their forward ends with sprocket wheels 45 over which -achain 46 passes. Rotation of one shaft 41 will therefore rotate theother in timed relation thereto.

To'rotate the feed cams 42 slowly and in a step-by-step manner at theend of each rotation of the spindle 30 the shaft 41 on the right side isprovided at its, rear end with a gear 47. This gear 47 as the slide 35moves toward the right engages a tooth 48 formed on a plate secured tothe free end of a horizontal arm 49 mounted for oscillation about avertical axis. By striking the tooth 48 the gear 47 and shaft 41 arethus rotated. through a small angle thus rotating the .feed cams 42 asimilar amount. The arm-49 is held out of the path of movement of thegear 47 except when feeding movement of the tools 40, at the end of eachrotation of the gear W, is required. In order to oscillate the arm 49 toefi'ect rotation of the feed cams for the 5 tools at the completion ofeach rotation of the gear W being fin'shed the main drive /shaft- 1 17has keyed the to a small crank 50. To. the crank 50 is attached aconnecting rod 51.,

I the opposite end-of which is attached to an m oscillating lever .52carrying a pawl 53. Betation of the main shaft 17 will thereforeoscillate the pawl 53 which engages the teeth of a ratchet wheel 54 andcauses the ratchet wheel 54 to be advanced one tooth for each rotationof the main shaft 17. 'A ratchet wheel 54 is used having as many teethas the gear W being finished so that one complete rotation of theratchet wheel 54 will take place upon a complete, rotation of the gear Wbeing finished. The ratchet wheel 54 is on the forward end of a shaft 55carrying a disk 56 having a notch 57 in its periphe Rotation of the disk56 therefore allows t e arm 49 on a shaft 59 to be oscillated by aspring 60 when the notch 57 is rotated to a position opposite a smalllever 58 on the lower end of the vertical shaft 59 to which the arm 49is fastened. As soon as the slide 35 starts its movement toward the leftthe arm 49 is swung out of engagement withthe gear 47 so that the gear47 and shaft 41 are not reversed, By these means the cams 42oare slowlyrotated and thus advance the tools 40 to' successively advanced cuttingpositions.

T As shown in Fig. 5' the feed cams 42 have two.

series of peripheral portionsbf successively increased radius. During ahalf rotation of these cams which takes place during the com: pleteoperation upon a gear the tools will 40 be advanced to four differentadvance positions. 7 I To properly position the gear W to be finished onthe spindle '30 so that the sides of the gear teeth will be engaged bythe tools 40 a special positioning device is employed.

This comprises a vertically movable plunger 7 61 suitably mounted withinthe slide 35 and' having a forked up er end adapted to engage oppositesides 0 a gear tooth on the gear 5 W. A spring 62 normally holds theplunger 61 downward and it is adapted to be forcedupward by a rod 63having rack teeth along one side engaging a segment of a gear 64 on aforwardly extending shaft 65.' As the T 5 65. To actuate the shaft 65 toforce the operation of the machine, interlocking means are provideddisposed between the operating lever 29 for the machine and the plungeroperating lever 69. On the operating lever 29 is a'short arm to whichvertically movable link 70 is attached, the opposite end of whichisslotted. A stud fastened in the base 10 engages the slot and thus,permits sliding movementof the link 70. A bar 71 pivot: ally connectedto the lever 69 on the forward end of the shaft 65 for actuating theplunger 61 is supported at its opposite end for horizontal slidablemovement when the shaft 65 is oscillated. The outer end of the bar 71extends into the path'of movement of the 7 0 operatedv by the operatinglever 29 when the plunger 61 is in its upper position. The operatinglever 29 therefore cannot be operated. When the plunger .61 is down andthe operating lever 29 isoscillated to start the machine the link 70extending past the path of movement of the bar 71 prevents the plunger61 beingraised.

In order to index the work spindle 30-to present the gear teeth of thegear W being finished successively to the tools '40 without loss ofexcess time, the indexing motion of the spindle 30 is effected duringthe oscillatory movement of the spindle 30 and its sleeve 12. During themid portion of the oscillatory movement of the sleeve 12 and workspindle 30 both of the tools 40 are'entirely free from the gear W beingfinished. It is during this portion of the cycle of operations that theindexing is effected. As the spindle 30 and sleeve-12 are oscillating inone direction and reach substantially their mid position the no spindle30 is moved angularly relative to the sleeve 12 an amount to presentsuccessive teeth to the tools 40. While the sleeve 12 and spindle 30 areoscillating in the opposite direction a part of the-indexing mechanismis movedto a position so that no indexing of the spindle takes place.

To effect the indexing movements while the spindle 30 is beingoscillated in one direction but not in the opposite direct-ion theindexing and spindle locking cams are mounted on a swinging frame 75mounted within the base 10. -To oscillate this frame 75 a. drum cam 76is mounted on a shaft 77 in alinement withthe shaft 17 on which the gear16 i sm'oiinted. A crank arm 78 connected to the'ccentric pin 15 iskeyed to the shaft 77 at one end so that thecam 76 is rotated at thesame speed as the gear 16. The cam 76 is provided on its periphery witha groove as shown in- Fig. 2 so and before the. spindle 30 is oscillatethat with each rotation of the cam 76 a downwardly extended arm 79 keyedto the shaft 81 is oscillated back and forth. A roll 80 formed on thisarm 79 engages the groove in the cam 76. The frame 75 is keyed to theshaft 81 so that the frame 7 5oscillates back and forth in 84 havingspaced notches 85 cut into its periphery corresponding in number to thenumber of teeth in the gear W being finished.

One of these notches 85 is engaged during the cutting periods of theoscillatory motion of the splndle 30 by a locking bolt 86 on a plate 87slidable radiallyin anarm 88 carried by and oscillating with the sleeve12. While the plunger or bolt 86 isin one of the notches 85 of the indexplate 84 the work spindle 30 will be oscillated with the sleeve 12.. Thecutting action of the tools 40 takes place during the portions of theoscillatory movement of the sleeve 12 and spindle 30 while this lockingbolt 86 is engaged-within a notch 85. To withdraw the locking bolt 86from the notch 85 the inner end of the member 87 carrying the bolt 86 isprovided with a roller 89 entering a small cam groove 90 ina plate 91surrounding andfreely rotatable on a hub formed on the plate 88. Angularmovement of this plate 91 to eflect disengagin and engaging movement ofthe bolt 86 is e ected by a slidable bar 92 in the arm'88 having rackteeth engaging gear" teeth on the plate 91. Movement of the bar 92 todisengage the bolt 86 is obtained by contact with the cam 83 on theswinging frame 75 by a roller 93 on the lower end of the bar 92.Movement of the bar 92 in a direction. to engage'the bolt 86 in a notch85 is accomplished b means of a helical spring 94. One end is ast-to thearm 88 and the other end to a stud on the bar 92 extending through anelongated notch in the arm. The cam 83 by-whlch the bar, 92 is movedupward is positioned and formed so that itwill unlock the bolt justbefore the indexing movement of the spindle takes place and will permitlocking movement of the bolt as soon as the indexingis com lpte enoughfor the opposite tool 40 to engage another gear tooth. Fig. 9 'shows'theposition of the spindle locking mechanism during that portion of thespindle oscillation during which the indexing is taking place.

The means to index the spindle 30 relative to thesleeve 12 comprise thefollowing 'mech anism separately shown in Fig; 8. This mechanism ismounted on the sleeve and co operates withcams mounted on the swingi-ngframegf. The arm 88 previously referred to in connection with theoperation of the ;locking bolt' has-an arm 95 rotatably mount-.

pivotally mounted pawl 96 engaging at its outer end a notch 85 in theindex plate 84. Movement of this pawl 96 while engaged in a notch 85 byoscillating movement of the arm 95 relative to the sleeve 12 and the arm88'fast thereon advances the spindle 30 and the gear W to a new indexedposition. This movement of the pawl 96 takes place while the sleeve-12is in approximately mid position and is effected by acam 97 on theswingmg frame 75. A lever- 98 pivotally mounted on the arm .88 aboutstud 99 has a roller 100 at its outer end contacting with the cam 97when the swinging frame 75 is in one of its oscillated positions' Theopposite end of the lever 98 is slotted and adjustably attached to anadjustable reach arm 101, the

opposite end of which is attached adjustably to an arm 102 pivoted aboutthe axis, of the pawl .96. A spring 103 surrounding the pivot of thelever 98 normally holds the pawl 96 toward its outer position againstastop 104 formed on the arm95, a pin 105 onthe lever 102 bearing againstthe stop when the pawl 1s in its outer position. As the parts on thesleeve 12 are moving in the direction indicated by the arrow in Fig. 8but before with the pawl 96 engaged in a notch 85 of the index plate 84forces the arm 95 carrying the pawl 96 to move relative-to the sleeve 12and 'thus index the spindle 30. The first movement of the lever 98contacting with the cam 97 oscillates lever 102 about the center formingthe pivot for the indexing pawl 96 and.

this forces the paw F96 into a notch 85. As :plon as the pawl 96 hasengaged a notch 85 e theaxis of the sleeve 12. By adjusting the pivotalconnections at the ends of the connecting rod 101 this movement of thearm95 and the pawl 96 which rotates the index plate 84 can be wideladjusted.

To prevent t e tools 40 dragging over the finished surfaces of the gearteeth on the oscillato movement of the, spindle 30: and gear, during thefirst portions of their arcs of movement, means are provided to veryslightly oscillate the spindle 30 at the extreme end of its oscillatorymovement in a direction to slightly separate the-engaged tool 40 fromthe gear W. This movement takes place before the slide 35 carrying thetools 40 starts on its rearward path. An arm 106 keyed to the sleeve 12and-preferablyforminglthe sup-- of the arm'88 bgether with the lockingbolt 86 and associated parts permits a correspondpawl 96 and its arm 95are rotated aboutingly sli'ght angular movement ofthe spindle I 30'andgear W. Inorder to move the ann .88 from one adjustable stop or abutment107 to the other at the extreme oscillated positions of the cam 32 andspindle 30 a lever 108 is pivotally mounted on the arm 106, its outerend being adapted to engageabutments 109 secured rigidly to the frame orbase of the machine and suitably spaced apart. This is shown in Fig. 7from which it will be evident that at each limit of oscillation of thesleeve 12 and parts oscillating therewith the lever 108 will beoscillated about its pivot in one or the other direction. Pivotalmovement of the lever 108 moves a slidable member 110 retained in thearm 106, this movement being effected by means of gear teeth formed'onan arm of the lever 108 and on theslidable memher 110. The slidablemember 110 is disposed radially of the plate 106 and is connected to aslidable member 111 in the arm 88 by a pin 112. By means of this pinconnection 112 between the slidable members 110 and 111 the members 110and 111 may be moved angularly relative to'each other. The member 112 isdisposed within the arm 88 slightly obg5 liquely relative to radiallines so that movement of the members 110 and 111 inward and outwardwill angularly move the arm 88 relative to the member 106 fast-on thesleeve 12.

Themovement of the arm 88 relative to mem- I0 her 106 is limited by theabutment 107 which may be slightly adjusted. The abutments 109 areresiliently forced forwardly within casings 113 by springs 114 and whenforced inwardly take up positively shoulders 116. With the sleeve 12 andspindle oscillating in the direction shown by the arrow in Fig. 7 whenthe lever 108 reaches the abutment 109 it forces the abutment 109 inwardand when this abutment takes up \0 against the shoulder 115 thelever-108 is oscillated slightly. This slight movement of the lever 108releases the sliding blocks 110 and 111 from their locked position withthe mem-' her 106 forced toward one of the stops 107 on member 88. Theabutment 109 then springs outward and oscillates the lever 108 to forcethe members 110 and 111 to their opposite position. This relativelymoves the member 106 ,angularly of the member 88 and rotates the spindlein a direction to separate the gear W from the engaged tool 40. v

To stop operation of the machine when the gear W being operated on hasbeen completely finished, means are provided to move the main startinglever 29 to. its inoperative position. 011' the shaft carrying thenotched disk 56 is a pinion 117 engaging a gear 118 of larger size on ashort shaft 1119 below the shaft 55. The ratio between the gears 117 and118 is equal to the number of complete rotations of the gear W beingfinished required while being operated on by the tools 40.-'The shaft119 will therefore make one complete rotation during the cycleof'operations of the machine. On the fortate the shaft 17 and thusactuate the mechaward end of this shaft 119 is a disk 120 having apirgjection 121 extending from its rear face. en operations on the gearhave been completed this projection 121 forces a bolt 122 rearwardagainst a spring by means of rod123. Movement of this bolt 122 releases.a spring pressed lever 124 on the shaft 125 to which themain operatinglever 29 is keyedso that this lever 29 is moved to its inoperativeposition, thus stopping the machine. The

position of the parts shown in Fig. 2 is that after the lever 29. hasbeen moved to'inoperative position. Movement of the lever 29 to startthe machine resets the bolt 122 and memher 124. A detent 126 having twonotches resiliently retains the operating lever 29 in its operative andinoperative positions b en gagement with the notches of a small p unger127, The detent 126 is rotatably mounted adjacent the member 124 and isangularly moved by movement of the lever 124 throu h a pin 128 on thed'etent being engaged by t e sides of a notch formed in a plate130secured to the lever'124.

To facilitate manual operationof the machine during preliminaryadjustments, the shaft 17 is provided with a sprocket wheel 131 overwhich passes a chain 132. This chain 132 passes over a smaller sprocketwheel 133 on a shaft or stud 134 conveniently lo- 95 rated on the frontof the machine. A hand wheel 135 keyed to rotate with the sprocket wheel133 enables an operator to slowly ronism of the machine. V To adjust themachine for difierent diameters of gears W the thickness of they member34 carrying the slide 35 may be. chosen to position the rollers 37 andtools 40 correctly relativelyto the cam 32 and blank W. The amount ofoscillationgiven the sleeve 12 and spindle 30is adjusted by the crank15. To

control the angular movement of the spindle 30 relative to the sleeve 12forindexing the blank 'W the position of the arm 101 is Changed. It willbe understood also that the index plate 84 will have notches ual to, ora multiple of,, the number of teet .to'be' cut in the blank Topositively hold the indexing pawl 96 within a hotch 85 a roller 96 maybe mounted thereon and ads. ted to engage during a portion of the oscatory motion of the sleeve. 12 with a cam'97' on the swinging member 75.r

, Inoperation the sleeve 12 is oscillatedby 133 rotationof the maindrive shaft 17 and the crank 'pin 15. By meansof the-cam 32 on thesleeve 12 the tool carrying slide 35 is reciprocated. A gear blank Wmounted to oscillate with the sleeve 12 will therefore have its-teethengaged and cutv by the tools 40 toward the ends of the oscillatorymovement of thesleeve 12 in both directions.

Indexmg movement of the gear blank W V relative to the sleeve 12 topresent-successive teeth to the tools 40 takes place with the tool,slide 35 approximately at its mid-position and while the tools are outof contact with the gear blank. This indexing movement is accomplishedby the mechanism shown in Figs. 6 et seq. In order that'indexingmovements may not take place on each oscillatory movement of the sleeve12 the actuating mech-f anism comprisin the cams carried by the swingingframe ?5 are moved. into and out of operative position in timed relationwith the oscillatory movement of the sleeve 12.

- This is accomplished by the cam 76 rotated by the main drive shaft.With the frame 7 5 rying the gear blank is indexed.

in its inoperative position the sleeve'12 0scillates from one extremeposition to the other without indexing the gear blank and itsspin- 'dle30. On the reverse oscillatory movement of the sleeve 12the frame 75ismoved into operative positionso that the spindle 30 carto cut the teethupon several successive in dexingmovements of the blank W. 'As soon as acomplete indexing movement of spindle and blank takes place the feedearns 42 are rotated through acportion of a revolution so that eachsuccessive rotation of. the blank will serve to cut the teeth additionalamounts.

-'- When several complete indexing movements have taken place, themechanism is stopped preparatory to removing the finished gear andounting another blank in position. What we claim is: v

1. A gear finishing machine comprising-in combination, a base, agearsupporting spindle mounted for oscillation on a fixed axis thereomacam onisaid spindle adapted to be actuatedtherewit'h, .a slide on saidbase reciprocated by said cam While said spindle is oseillating, toolheads on said slide on .opposite' sides of the blank axis and havingtoolsprovided with cutting edges upon their end tapes engaging a gar'onsaid spindle dnring the movement of said spindle and slide,whereby'oppositely disposed tools alter 'nately engage said gear uponeach oscillation of said. spindle, and means to .'index-' said spindle.

2... A gear finishing machine comprising in combination, a base, agear-supporting spindle mountedfor oscillation on 'a' fixed axisthereon, a' cam on said spindle adapted to be actuated therewith, aslide on said base recip'rocated bysaid. cam' while said spindle is sitesides of the blank axis and having'tools provided with cutting edgesupon their end faces engaging a gear on said s indl during extremeoscillated positions 0 sai s indle and cam, whereby oppositely disposetools alternately engage said gear upon each oscillation of saidspindle, and indexing means for" said spindle operative during the mid-,portions of the oscillatory movements of said spindles.

3. A gear finishing machine comprising in combination, a base, a gearsupporting spindlemounted for oscillation on' a fixed axisl thereon, ac'am'on said spindle adapted to be actuated therewith, a slide on saidbase reciprocated by said cam while said spindle is oscillating, toolheads on said slide on opposite sides' of the blank axis and havingtoolsprovided with cutting edgesupon their end faces engaginga gear onsaid spindle',-Whereby oppositely disposed tools alternately engage saidgear upon each-oscillationJof said spindle, and indexing means for saidspindle operative during oscillation of said spindle and while saidtools are out of engagement with said gear.

4. A gear finishing machine comprisingin combination, a base, a gear suporting spindle'mounted for oscillation o fixed axis .thereon, a 'cam onsaid spindle adapted-to be actuated therewith, a slide on said base re-.ciprocatedby said cam while said spindle is oscillating, tool heads onsaid slide on oppo-, site sides of the blank axis and having toolsoscillating, tool heads on said slide on oppothereon provided withcutting edges upon theirend faces, whereby oppositely disposed toolsalternately engage said gear upon each oscillation'of said spindle,means to index said spindle, and means to advance said toolheadstoisuccessive operative positions.

5. A gear finishing machine comprising in combination,.a base, a. gearsupporting spin-- dlemounted for oscillation on a fixed axls'" thereon,a cam on said spindle adapted to'b e actuated therewith, a slide on saidbase reciprocated by said camwh'ile' said spindle is osc'illating, to olli ads on said slidenn opposite sides ofthe' b ank axis and having'toolsthereon provided with cutting edges upontheir end faces, wherebyoppositely disposed tools alternately engage said gear npon'eachoscillation of said spindle, means to index said spindle, and means toadvance said heads to successive operative positions after each'completerotation of the spindle,- 1 6. A gear finishing machine comprising in vcombination, a base, .a gear supporting spin-l Idle mounted foroscillation ona fixed axis thereoma oam on said spindle adapted vto'beactuatedtherewith, aislide on said base reciprocated by said cain' whilesaid spindle is oscillating, tool heads. on saidv slide, tools on 4 saidheads .providedwith cutting edges upon their end faces arranged inopposed-relation ice blank axis and having tools thereon provided withcutting edges upontheir, end faces, whereby oppositely disposed toolsalternately engage said, gear upon each oscillation of said spindle,means to index said spindle, and means to advance sa d tool heads tosuccessive operative positions.

8. A gear finishing'machine comprising in. combination, a base, a gearsupporting spindle mounted for oscillation on a fixed axis thereon, acam on said spindle having opposed cam surfaces so disposed thatdistances between points in said cam surfaces upon a tangent to a circlecoaxial with its axis of oscillation are equal, aslide on said basehaving rollers thereon contacting with opposite sides of said cam andreciprocated by said cam while said spindle is oscillating, tool headson said slide on opposite sides of the blank axis and having toolsthereon provided with cutting edges. upon their end faces, wherebyoppositely disposed tools alternately engage said gear upon eachoscillation of said spindle, and means to advance said tool heads towardeach other at the completion of each rotation of said spindle.

9. A gear finishing machine comprising in combination, a base, a gearsupporting spindle mounted for oscillation ona fixed axis thereon, asleeve surrounding said spindle, means to oscillate said spindle andsleeve through predetermined angular distances, means to index saidspindle relative to said sleevedurv axis thereon, a sleeve surroundingsaid spindle; means to oscillate said. spindle and 7 ing oscillatorymovement of said spindle and sleeve, a cam on said sleeve adapted to beactuated therewith, a slide on said base reciprocated by said cam whilesaid spindle and sleeve are oscillating, and tool heads on said slidehaving cutting tools thereon: provided with cutting edges upon their endfaces disposed to engage opposite sides of difl'erent teeth.

10. A gear finishing machine comprising in combination, a base, a gear Lsupporting spindle mounted-for oscillation on a fixed axis thereon, asleeve surrounding said spindle,

means to oscillate said spindle and sleevev through predeterminedangular distances,

means to index said spindle relative to said sleeve during oscillatorymovement of said spindle, a cam on said sleeve adapted to befactuated-therewith, a slide on said base disposed belowand movable atright angles to.

the axis of said spindle and reciprocated by said cam while said spindleandsleeve are inrcombi'nation, a base, a gear supporting spindle mountedfor oscillation ona fixed axis, a sleeve surrounding said spindle, meansto oscillate said spindle and sleeve through predetermined angulardistances, means to lndex said spindle relative to said sleevedur ingoscillatory movement of said spindle and sleeve, a cam on said sleeveadapted to be actuated therewith, a slide transversely movable on saidbase reciprocated by sald cam while said spindle and sleeve areoscillating,

and tool heads adjustably mounted on said slide and having cutting toolsthereon provided with straight cutting edges upon their end faces'anddisposed to engage opposite sides of difl'erent teeth.

'12. A gear finishing machine comprising in combination, a base, a gearsupporting spindle mounted for oscillation on a fixed axis thereon, asleeve surrounding said spindle, means to oscillate said spindle andsleeve 1 through predetermined angular distances,

means .to indexv said spindle relative to said' sleeve duringoscillatory movement of said spindle and'sleeve, a cam on said sleeveadapted to beactuated therewith, a slide on said base reciprocated bysaid cam I while said spindle and sleeve are oscillating, tool heads onsaid slide having cutting tools thereon provided with cuttingedges upontheir end faces disposed to engageropposite sides of different teeth,and means to simultaneously advance said tools to successive operativepositions.

13. Agear finishing machine comprising in combination, a base, a gearsupporting spindle mounted for oscillation on a fixed sleeve throughpredeterminedangular dis: tances,mans to index said spindle relative tosaid sleeveduring oscillatory movement of said spindle, a cam onsaidsleeve adapted to be actuated therewith, a slide on said base disposedbelow and movable at right angles to the axis of said spindle andreciprocated by said cam while said spindle and sleeve are oscillating,tool heads on said slidehaving cutting tools thereon provided withcutting edges upon their end faces disposed to engage opposite sides ofdifierent teeth, of the gear on said spindle, and means-to "advance saidtool heads toward each other to successive operative positions upon eachsuccessive rotation of said spindle. 14. A gear finishing machine comprsing in combination, a base, a gear supporting spindle mounted foroscillation on a fixed axis, a sleeve surrounding said spindle, means tooscillate said spindle and sleeve through predetermined angulardistances, means to index said spindle relative to said sleeve duringoscillatory movement of said spindle, a cam on said sleeve adapted tobeactuated therewith, a slide on sa1d base reciprocated by said camwhile said spindle'and sleeve are oscillating, opposed tool heads. onsaid slide having cutting tools thereon provided with cutting edges upontheir end faces disposed to engage opposite sides of different teeth,and cam means on said slide to advance said tools heads .to successiveoperative positions.

"15. A gear finishing machine comprising in combination, a base, a gearsupporting spindle mounted for oscillation -on a fixed axis, a sleevesurrounding said spindle, means to oscillate said spindle and sleevethrough predetermined angular distances, means to index said spindlerelative to said sleeve during oscillatory movement of said spindle andsleeve, a cam on said sleeve adapted to be ac tuated therewith, a slidetransversely movable on said base' reciprocated by said camv while saidspindle and sleeve are oscillating,

tool heads adjustably mounted on said slide and having cuttings toolsthereon provided Withstraight cutting edges upon their end faces anddisposed to engage opposite sides of different teeth, and means toadvance said tool heads to successive operative positions.

16. A gear finishing machine comprising in combination, a base, a sleevemounted for oscillation therein, a work supporting spindle coaxialwithin said sleeve, means to oscillate said sleeve, means to index saidwork supporting spindlerelative to'said-sleeve, a.

cam oscillated'with said sleeve, a slide on. said base reciprocatedbymovement of-said cam, tool heads on said slide having straight edgedtools thereon upon their end faces, and means to simultaneously movesaid tool heads on the slide towards each other during oscillatorymovement ofsaid sleeve and reciprocatory movement of the slide.

17. A gear finishing machine comprising. in combination, a base, asleeve mounted for oscillation therein, a work supporting spindlecoaxial within said sleeve, means to oscillate said sleeve, means toindex .said work supporting spindle relative to said sleeve, a

cam oscillated with said sleeve, a slide on said base reciprocated bysaid cam, tool heads on said slide having straight edged tool's thereonupon their end faces, cam means to simultaneously move said tool headson the slide towards each other, and means to efiect operation of saidcam'means at the end of each rotation of said spindle.

i 18. A gear finishing machine comprising in combination, a base, asleeve mounted for oscillation therein, a work supporting spindlecoaxial within said sleeve, means to oscillate said sleeve, means toindex said work supporting spindle relative to said sleeve, a camoscillated with said spindle, a slide on said base reciprocated by saidcam, tool heads having straight edged tools thereon upon their endfaces, and means to move said tool heads on the slide towards each otherat the end of each rotation of said spindle and during oscillatorymovement of said sleeve.

19. A gear finishing machine comprising in combination, a base, a sleevemounted for oscillation therein, a work supporting spindle coaxialwithin said sleeve, means to oscillate said sleeve, index means mountedon said sleeve and work supporting spindle whereby said work supportingspindle may be indexed relative to said sleeve, and means positioned toefiect indexing movement of said work supporting spindle relative tdsaidsleeve while said spindle is rotating in one direction, saidlast-mentioned means being moved to ihoperative position during.rotation of said spindle and sleeve in the opposite direction.

- 20. A gear finishing machine comprising whereby said work supportingspindle. may be indexed relatlve to said sleeve,.means posit1oned toeffect indexing movement of said work supporting spindle relative tosaid tating in one direction, and cam means to move said last mentionedmeans to inopera-- tive position when said spindle and sleeve are movingin the opposite direction.

21. A gear finishing machine comprising 1n combination, a base, a sleevemounted for oscillation therein, a'work supporting spindle coaxialwithin said sleeve, means t oscillate said sleeve, index means 'mounteon said sleeve and work supportin spindle whereby sa1d work supportingspin e may be indexed relative to said sleeve, a swinging frame, cams onsaid frame fcoacting with said means on said sleeve and spindle toefiectsaid index: ing movements, and means to move said swinging frameinto and out of operative position in timed relation to the; movementsof said sleeve and spindle.

22. A gear 'finishing machine comprising' .in combination, a base, asleeve mounted for sleeve while said spindle and sleeve are roincombination, a base, a gear sufpporting spindle mounted foroscillationon a xed axis thereon, opposed tools slidably "mountedon said base andadapted to engage a gear on said spindleduring oscillatory movements ofsaid spindle, andmeans to slightly rotate the spindle at the oppositeends of its oscillatory motion to free the tools from contact with thegear during retrograde movement of the tool over the gear.

23. A gear finsbing machine comprisingin combination, a base, a gearsupportin spindle mounted for oscillation on a fixe axis thereon,opposed tools slidably mounted on said base, means to oscillate saidspindle and reciprocate said tools to engage a gear on said spindle asthe spindle approaches its extreme oscillatedpositions, and means toslightly rotate said spindle in a direction tofree the gear fi'om a toolas soon as the spindle is oscillated to its extreme position.

24. A gear finishing machine comprising in combination, a base, a gearsupporting,

spindle mounted for oscillation on a fixed axis thereon, opposed toolsslidably. mounted on said base, means to efi'ect sliding movements ofsaid tools in timed relation to oscillatory movements of said spindle,and means to slightly oscillate said spindle at its extreme. oscillatedpositions in a direction to return the spindle to its central positionbe fore said tools are rection. a

25. A gear finishing machine comprising in combination, a base, a gearsupporting spindle mounted for oscillation on a fixed moved. in theopposite diaxis thereon,'a sleeve surrounding said spindle, means tooscillate said sleeve, opposed tools slidably mounted on said base,means to e'fiect sliding movements of said tools in timed relation tooscillatory movements of said sleeve, an index plate on said spindleadapted.

to be engaged by a locking bolt, asnpport for said lochng bolt mountedon said sleeve, and

means to slightly move said support relative to said sleeve at theopposite ends of the oscillatory movement of said spindle and sleeve 26.A. gear finishing machine comprising in combination, a base, a gearsupporting spindle mounted for oscillation on a fixed axis thereon, asleeve surrounding said spindle, means to oscillate said sleeve, opposedtools slidably mounted on said base, means to efiect sliding movementsof said tools in 'timed relation to oscillatory movements of saidsleeve, an index plate on said s indie adapted to be engaged by alocking olt, a

sleeve and engaging said'abutments to slightly move said. supportrelative to said sleeve at the opposite ends of the oscillatory movementof said spindle and sleeve.

In testimony whereof, we hereto our signatures.

HUBERT D. TANNER' RQBERT 1R. WEB,

